Chi-Hwi Wang

Date of Award


Document Type


Degree Name

Master of Science (MS)


Chemical Engineering


A continuous fluidisovi bed drier was designed and constructed for drying of lump lignite. The fluidised Led was 2 ft. long, 0.5 ft. wide and 1 ft. deep. The support was a grid of 1/2 in. steel rods with 1/4 in. clearance between them. Hot coiubustion gases war© used to fluidize and. dry the lignite, and a superficial gas velocity of 30 ft./sec. was used, Lamp lignite of the size range 3/4 in. x 1/4 in. and 354 moisture was successfully dried in the equipment. The range of successful operation was 400 to 600 °F inlet gas temperature and 400 to 1300 lb./hr. lignite feed rate. Product as low as 184 moisture was obtained. Size degradation of the lignite was severe\ the fraction of feed reduced to below 14 mesh being from 17 to 55 percent in those runs. Another serious problem was ignition of lignite in the bod. Dead spots in the bed in early runs caused ignition, but even after these dead spot© had been eliminated, fire always secured eventually at inlet temperatures above 650 °F.